Coupling structure for bearing and bushing

ABSTRACT

A coupling structure for bearing and bushing comprises a ball bearing, a washer and an oil-retained bearing housed sequentially in a housing chamber of a bushing. The housing chamber has one end formed a lip opening for anchoring the bearings and the washer such that the bearings and the washer are allowed to attain precise positioning and concentricity, and reduced vibration, and prevent lubrication oil of the oil-retained bearing from flowing to the ball bearing thereby effectively prevent noise and vibration from taking place.

FIELD OF THE INVENTION

[0001] The present invention relates to a coupling structure for bearingand bushing and particularly a coupling structure that allows a bearing,a washer and an oil-retained bearing to have accurate positioning andconcentricity, and reduced vibration and prevent lubrication oil fromflowing from the oil-retained bearing to the ball bearing to enhancelubrication effect, and effectively prevent noise and vibration.

BACKGROUND OF THE INVENTION

[0002] The rapid technology innovations and developments have raisedgreat awareness among people on the requirements of lower energyconsumption and miniature products. To meet these requirements, demandsfor enhancing machining precision and matching accuracy have alsoincreased, particularly on miniature high speed rotational elements.

[0003] Nowadays, operation stability of miniature brushless motors hasbecome increasingly important. In recent years, a lot coupling productsfor bearing and bushing have been developed and introduced. Forinstance, to dispose a ball bearing and an oil-retained bearing in alinear barrel type bushing is one of such products. It has theadvantages of a ball bearing and an oil-retained bearing, and is easyand simple to assemble, hence is well accepted. However there are stillproblems in assembly and utilization, notably:

[0004] 1. The two bearings are difficult to position precisely in alinear barrel type bushing.

[0005] 2. Concentricity and verticality of the two bearings also aredifficult to attain. To achieve this requirement needs very high precisemachining, and will result in higher production costs.

[0006] 3. During operation, lubrication oil in the oil-retained bearingwill flow into the ball bearing and mixes with the lubrication oil ofthe ball bearing. Blending these two different types of lubrication oilswill destroy the atomic bond and downgrade the lubrication effect, andgenerate noise and vibration.

SUMMARY OF THE INVENTION

[0007] The primary object of the invention is to resolve the foregoingdisadvantages. The invention aims to provide a simple structure to allowa ball bearing, a washer and an oil-retained bearing disposedsequentially into a housing chamber of a bushing to achieve precisepositioning and concentricity between the bearings and bushing, and alsoto reduce vibration, and prevent lubrication oil of the oil-retainedbearing from flowing to the ball bearing thereby to enhance lubricationeffect, and prevent noise and vibration from taking place.

[0008] The foregoing, as well as additional objects, features andadvantages of the invention will be more readily apparent from thefollowing detailed description, which proceeds with reference to theaccompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009]FIG. 1 is an exploded view of the invention.

[0010]FIG. 2 is a sectional view of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT

[0011] Referring to FIGS. 1 and 2, the coupling structure of theinvention includes a ball bearing 2, a washer 3 and an oil-retainedbearing 4 housed sequentially in a housing chamber 11 of a bushing 1.

[0012] The housing chamber 11 has one end formed a lip opening 12 toanchor the ball bearing 2 and the washer 3, and to allow the sidesurfaces of the ball bearing 2, the washer 3 and the oil-retainedbearing 4 having closed contact with the interior wall of the housingchamber 11 thereby to achieve precise positioning and concentricity inthe bushing 1.

[0013] The washer 3 (may be a disk type washer or a spring washer), inaddition to damp vibration, also can isolate and prevent lubrication oilof the oil-retained bearing 4 from flowing to the ball bearing 2,thereby to further reduce vibration.

[0014] The coupling structure of the invention thus allows the ballbearing, the washer and the oil-retained bearing housed in the bushingwith precise positioning and concentricity. It also can damp vibrationand prevent lubrication oil of the oil-retained bearing from flowing tothe ball bearing, thus effectively prevents noise and vibration fromtaking place.

What is claimed is:
 1. A coupling structure for bearing and bushingcomprising a ball bearing, a washer and an oil-retained bearing housedsequentially in a housing chamber of a bushing, the housing chamberhaving one end formed a lip opening for anchoring the ball bearing andthe washer such that the bearings and the washer are allowed to attainprecise positioning and concentricity, and therefor to achieve reducedvibration, and prevent lubrication oil of the oil-retained bearing fromflowing to the ball bearing thereby effectively prevent noise andvibration from taking place.
 2. The coupling structure for bearing andbushing of claim 1, wherein the washer is a disk type washer.
 3. Thecoupling structure for bearing and bushing of claim 1, wherein thewasher is a spring washer.